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Financial Instruments (Summary Of Location And Fair Value Of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Net asset (liability) | $ (483) | $ (3,260)
Aluminum Futures Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Net asset (liability) | (492) | (3,581)
Aluminum Futures Contracts | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 0 | 48
Aluminum Futures Contracts | Designated as Hedging Instrument | Accrued Expenses |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives: Aluminum futures contracts | (483) | (3,260)
Aluminum Futures Contracts | Designated as Hedging Instrument | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives: Aluminum futures contracts | $ (9) | $ (369)

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